National Dental Examining Board of Canada (NDEB) Practice Exam 2026 - Free NDEB Practice Questions and Study Guide

The gingival collar, also known as the gingival cuff, is made up of circular fibers. These fibers are responsible for connecting the gingival tissue to the underlying tooth structure and creating a protective barrier around the tooth. The other options (B, C, and D) refer to different types of fibers found in the periodontal ligament, but they are not specifically responsible for forming the gingival collar. So while they may play a role in supporting and anchoring the tooth, they are not the main fibers that make up the gingival cuff. Therefore, A is the correct answer.